Today I checked the air temperature sensor (on the TB) and found it a bit oily,and the intake manifold is a bit oily inside too,not much but is there.

Is that normal?causes?resolution?

Edited 12 March, 201214 yr by IulianE

It's normal. Your crankcase ventilation system releases oil as vapour back into the intake to be burnt up in the engine. If you take your intercooler off there'll be loads of oil in the bottom of that too. The short term fix is to regularly clean the TB, intercooler and boost pipework, the long term fix is to fit an oil catch can then empty it every few months.

The bit of oil that goes into the manifold helps to lubricate round the tops of the valve stem oil seals so isn't totally a bad thing

Hello. I also found some oil in the intake manifold, and what I also found is that the pcv membrane is like not sticked to the system, I can lift up the membrane, if I push it with something long enough. Is this also OK, or I should change the intake pipe?

I attach a picture.

 

Thank you.

I forgot to mention, it is a 1.6 Mpi engine, BFQ engine code.